Spark-plug.



P. T. CAMPBELL.

SPARK PLUG.

APPLICATION FILED JULY 3, 191a.

Patented June 30, 1914.

511 1- van/E01: 92 522 scouring the term nals "of the electrodes to thcrcagainst in an obvious State of Connecticut, have invented certain new and useful Improvements in Sparked relative to each other n order to bring a same to sparking positlon.

.body or chamber closed at tom end to provide a gas chamber that forms .charge will rush past the terminal with great force.

UNITED STATES .naa anr FFIGEZ Specification of Letters Patent.

Application filed July 3, 1918.

the charge with the terminal to enhance the Be it known that I, PAUL T. CAMPBELL a scouring action, whichlatter is also aug-- c tizen of the United States, residing in t 3-- mented by the fact that the tubular parts are city of Bndgeport, county of Fairfield, made long. to thus assure intimate contact of the. charge with the greater portion of the Patented June 30, 191% semi Na 777,247.

To all whom it may concern length of the latter.

Plugs; and I do declare the following to be The tubular part 4 afi'ords both the inlet a full, clear and erect description of the 1I'1-' and outlet for the lu interior or chamber, ventlon, suc as Wlll enable others skilled in and the wall that the bore 5 provides formsthe art to which it appertains to make and the other terminal of the spark plug.

use the same.

This invention relates to certain new and useful improvements in spark plugs, and the object thereof is to provide a spark plug which has means incorporated therein for I An additional advantage of the conical bore is, that, should the sparking distance between the terminals be too little, this may be remedied byshortening the terminal 6 so that its end may be higher up within tilt conical bore and therefore separated byaa free same of oil, carbon, or other impurities.

Further the" invention aims to. provide and this shortening of the terminal G-may means whereby the termmals may be ad ustbe effected in any suitable manner, either by making its normal length less or by adjust ing the same by any ordinary meansprovided for thepurpose of elevating or lowering the terminal.

prefer to extend the tubular portion within the hollow chamber since a conven- Inthe drawings: Figure 1 is a vertical sectional view of the invention; Figs. 2 and 3 are fragmentary views similar to Fi 1 but showing modified forms of. my invention.

The invention consists rimarily in the provision of a spark plug that has a hollow tom of such chamber for any liquefied gas, its lower or botbut I do not wish to be limited in this respect since such tubular portion may project downwardly from the bottom of such chamher, as shown in Fig. 3. i i In Fig. 2 a modified form of the invention is shown in which the wall formed by the opening 2 in the plug bottom is threaded to receive the exteriorly threaded enlargement or boss 7 at the base'of the tubular part, a lock nut 8 being engaged withthe threads of the boss and with the outer face of the plug bottom.

In order to provide for the adjustability of the terminal (3 the latter is threaded. throughout the greater portion of the length of its upper portionaud engaged with a nut S) which latter is stationary so that it will be readily understood that it is merely necessary to relax the lock nut 10 which engages the terminal at the top of the plug, and then turn the terminal cithcr'by means of ascrew driver inserted Within a slot' 11 at the top of the terminal or in an y other suitable manner.

From the above it will be apparent that the electrode terminals may be adjusted to increase .or decrease the space between them, and that the wire 6 which forms one termi-' nal is parallel with the axis of the bore 5 the lower part of the plug, and an elongated flared tubular portion which is'connected to the central part of the chamber bottom and communicates with the interior of the chamberr The body 1 of the 'sparlrplug has an opening 2 formed in its lower end, in whichopening the base 3 of an elongated tubular part 4 is secured by cement or in any other suitable or approved manner. Thebore 5 oi the part- 4; is conical in form and. flares inwardly as depicted in Fig.1 of the drawings.' By providing a conical form of fbore it provides a wedge-shaped wall, so to speak, that surrounds the terminalo so that during the working strokes of the piston, the charge in its movements past the terminal (3 will scour or clean the latter by being wedged manner. On the compression stroke a part of the charge is forced into the plu body, through the smallest end of the ore 5 and due to the contracted nature of said smallest end, the

The walls formedby the bore are disposed in very close proxlmity to the terminal so as to insure i'ntlmate contact of terminal throughout a greaterspace from the wall of the latter, 3

ient receptacle is thereby formed at the bot- 15 here wire extending through said hollow the Walls of Which letter form the in a direct line "with the currents created by the eon'ipression and exhaust within the eyl-.

inders,

What is claimed is: v

A spark plug having at its lower end a hollow chamber closed at the bottom the latter formed with an elongated tubular portion the here of which is conical and flared npvmrdly .Ulil leasls'llireetlyinto said chamher and etl'orrls the sole inlet and outlet the roll the inner Well'ol' SLLlLl bore forming one terminal of the plug, and an elongated other 1 terininzrl and that said-wire and runs extend i ftlltl means for I height of the end of Sitld Wire Within said bore whereby the terminals may have proper chamber and terl'nineting Within said bore, establishing the proper said Wire and the axis of spaced relation, I

substantially parallel with seid bore being each other and extendin 1n a direct with the currents created liy the compression and exhaust within the cylinders.

in testilnon'v whereof I afiixliny signature in presence of two Witnesses. l

' PAUL 'l. OltMlllilfllil'i.

Witnesses: I v

M. T. Lonennn.

line. 

